RE: 3W 75 PROBLEM
Update. Just flew my 3W 55 again today and I tweaked the needles again. I was still getting just a little drop off when rolling to inverted (thought I had it all out). I had to close them both just a tad today. The low end is now open 5/8 turn and the high needle is just under 3/4. Excellent transition, smooth steady idle, and tons of power at the high end. I'm convinced this phenomena is carburetor adjustment related now. At least it was for me.